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| author | Nathan Chancellor <nathan@kernel.org> | 2021-12-10 09:55:29 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-12-22 09:29:37 +0100 |
| commit | bca4a53ea72c6e4a8b28e0723e7020dffc73218d (patch) | |
| tree | b5c1c6e276b405aa8c3287fdc49daaa5a8f73556 | |
| parent | 166f0adf7e7525c87595ceadb21a91e2a9519a1e (diff) | |
| download | linux-stable-bca4a53ea72c6e4a8b28e0723e7020dffc73218d.tar.gz linux-stable-bca4a53ea72c6e4a8b28e0723e7020dffc73218d.tar.bz2 linux-stable-bca4a53ea72c6e4a8b28e0723e7020dffc73218d.zip | |
soc/tegra: fuse: Fix bitwise vs. logical OR warning
[ Upstream commit a7083763619f7485ccdade160deb81737cf2732f ]
A new warning in clang points out two instances where boolean
expressions are being used with a bitwise OR instead of logical OR:
drivers/soc/tegra/fuse/speedo-tegra20.c:72:9: warning: use of bitwise '|' with boolean operands [-Wbitwise-instead-of-logical]
reg = tegra_fuse_read_spare(i) |
^~~~~~~~~~~~~~~~~~~~~~~~~~
||
drivers/soc/tegra/fuse/speedo-tegra20.c:72:9: note: cast one or both operands to int to silence this warning
drivers/soc/tegra/fuse/speedo-tegra20.c:87:9: warning: use of bitwise '|' with boolean operands [-Wbitwise-instead-of-logical]
reg = tegra_fuse_read_spare(i) |
^~~~~~~~~~~~~~~~~~~~~~~~~~
||
drivers/soc/tegra/fuse/speedo-tegra20.c:87:9: note: cast one or both operands to int to silence this warning
2 warnings generated.
The motivation for the warning is that logical operations short circuit
while bitwise operations do not.
In this instance, tegra_fuse_read_spare() is not semantically returning
a boolean, it is returning a bit value. Use u32 for its return type so
that it can be used with either bitwise or boolean operators without any
warnings.
Fixes: 25cd5a391478 ("ARM: tegra: Add speedo-based process identification")
Link: https://github.com/ClangBuiltLinux/linux/issues/1488
Suggested-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/soc/tegra/fuse/fuse-tegra.c | 2 | ||||
| -rw-r--r-- | drivers/soc/tegra/fuse/fuse.h | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/drivers/soc/tegra/fuse/fuse-tegra.c b/drivers/soc/tegra/fuse/fuse-tegra.c index 3eb44e65b326..1a54bac512b6 100644 --- a/drivers/soc/tegra/fuse/fuse-tegra.c +++ b/drivers/soc/tegra/fuse/fuse-tegra.c @@ -172,7 +172,7 @@ static struct platform_driver tegra_fuse_driver = { }; builtin_platform_driver(tegra_fuse_driver); -bool __init tegra_fuse_read_spare(unsigned int spare) +u32 __init tegra_fuse_read_spare(unsigned int spare) { unsigned int offset = fuse->soc->info->spare + spare * 4; diff --git a/drivers/soc/tegra/fuse/fuse.h b/drivers/soc/tegra/fuse/fuse.h index 7230cb330503..6996cfc7cbca 100644 --- a/drivers/soc/tegra/fuse/fuse.h +++ b/drivers/soc/tegra/fuse/fuse.h @@ -53,7 +53,7 @@ struct tegra_fuse { void tegra_init_revision(void); void tegra_init_apbmisc(void); -bool __init tegra_fuse_read_spare(unsigned int spare); +u32 __init tegra_fuse_read_spare(unsigned int spare); u32 __init tegra_fuse_read_early(unsigned int offset); #ifdef CONFIG_ARCH_TEGRA_2x_SOC |